Volume 9, Issue 4 2401441
Research Article

Probing Photo-Assisted Charge Storage Mechanism Using Bi-Fe Perovskite Oxide Electrode for Solar Supercapacitor

Manopriya Samtham

Manopriya Samtham

Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552 India

Search for more papers by this author
Ajay Patil

Ajay Patil

Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552 India

Search for more papers by this author
Ekta Choudhary

Ekta Choudhary

Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552 India

Department of Physics, Indian Institute of Technology Indore, Simrol, Indore, 453552 India

Search for more papers by this author
Himanshu Srivastava

Himanshu Srivastava

Accelerator Physics and Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013 India

Search for more papers by this author
Ravindra Jangir

Ravindra Jangir

Accelerator Physics and Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013 India

Homi Bhabha National Institute, BARC Training School Complex, Anushaktinagar, Mumbai, 400094 India

Search for more papers by this author
Ram J. Choudhary

Corresponding Author

Ram J. Choudhary

UGC-DAE Consortium for Scientific Research (CSR) University Campus, Khandwa Road, Indore, 452001 India

E-mail: [email protected]; [email protected]

Search for more papers by this author
Rupesh S. Devan

Corresponding Author

Rupesh S. Devan

Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552 India

Centre for Electric Vehicle & Intelligent Transport System, Indian Institute of Technology Indore, Simrol, Indore, 453552 India

Multidisciplinary Academic Research Centre, National Dong Hwa University, Hualien, 974301 Taiwan

E-mail: [email protected]; [email protected]

Search for more papers by this author
First published: 23 December 2024
Citations: 2

Abstract

In this study, the rhombohedral crystalline pure phase BiFeO3 (BFO) of irregularly shaped spherical particles of ≈100 nm and energy bandgap of ≈2.31 eV are synthesized by sol–gel auto-combustion method and explored as electrode material for photo-assisted supercapacitor. The electronic structure studies revealed that the coexistence of heterovalent Bi and Fe elements accelerated the electrochemical redox kinetics and photo-assisted charge storage properties. The resonant photoemission studies confirmed that near the Fermi level, the valence band spectra comprised the Fe3d and O2p hybridized states. The Fe-O hybridized state felicitates the charge transfer transitions (O2p (h+) + hυ ↔ Fe3+ + e ↔ Fe2+), which assists the intercalation/de-intercalation process of OH anions. Therefore, BFO has delivered 26.77% photo efficiency and the enhanced specific capacity of 21 Cg−1 at 2 Ag−1 in aq. 3m KOH under illumination, which is attributed to the accelerated photo-generated charge carrier separation and storage with surface polarization effect. BFO also delivered capacitance retention of 77.5% even after 1000 continuous GCD cycles under visible light irradiation.

Conflict of Interest

The authors declare no conflict of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.